Cmmg Bbl Sub-Assm 22Arc 16.1 Mt 4140Cm Sbn

The CMMG .22 ARC barrel assembly is a 16.1-inch, complete sub-assembly built for AR15 platform rifles. If you're building a modern intermediate cartridge AR or upgrading an existing rifle, the .22 ARC delivers flat-shooting performance out to extended distances—ideal for precision target work, small-game hunting, or varmint control. This barrel assembly arrives ready to integrate into your AR15 build, with no secondary gunsmithing required.

Constructed from 4140CM chromoly steel with a nitride finish, the CMMG barrel resists corrosion and wear while maintaining the durability shooters expect from a mid-weight contour. The 1:7 twist rate stabilizes .22 ARC projectiles across the cartridge's range of bullet weights, from 40-grain varmint rounds to heavier match-grade loads. The rifle-length gas port is tuned for reliable cycling in a standard AR15 platform, and the muzzle is threaded 1/2×28 for direct attachment of suppressors or muzzle devices.

As a sub-assembly, this barrel includes everything needed for installation: the barrel itself, properly headspaced and ready to headspace your upper receiver. No additional barrel work, threading, or custom fitting—just bolt it in and start shooting. Whether you're assembling a dedicated .22 ARC rifle or swapping uppers to explore the cartridge's accuracy and range potential, this CMMG assembly cuts build time and simplifies the process.

Key Features

• 16.1-inch barrel optimized for .22 ARC ballistics and reach
• 1:7 twist rate stabilizes a wide range of .22 ARC bullet weights
• 4140CM chromoly steel with nitride finish for durability and corrosion resistance
• Rifle-length gas port for reliable AR15 cycling
• 1/2×28 muzzle threads accommodate suppressors and muzzle devices
• Complete sub-assembly—ready to integrate into your AR15 upper

Specifications

Frequently Asked Questions

Will this barrel work in my AR15 upper receiver?

Yes. This CMMG sub-assembly is designed for standard AR15 platforms and arrives headspaced and ready for installation in a compatible upper receiver.

What muzzle attachments fit this barrel?

The barrel is threaded 1/2×28, which is the standard .22 ARC thread pitch. Any suppressor, flash hider, or muzzle brake with that specification will fit directly.

Is this a complete barrel assembly or does it need additional parts?

This is a sub-assembly, meaning it includes the barrel ready to integrate into your upper receiver. You will need an upper receiver, bolt carrier group, and other standard AR15 components to complete a rifle.

What kind of shooting is this barrel suited for?

The 16.1-inch length and 1:7 twist are optimized for .22 ARC's extended-range capabilities, making it well-suited for precision target shooting, varmint hunting, and small-game applications.